• Retrofilling a “wet” transformer, UK

    Customer: Devonport Management Ltd (DML) Location: Devonport Royal Dockyard, UK Application: Distribution Transformer Highest Voltage: 11kV Rating: 800kVA Date: 2003 DML had a 30 year old free breathing mineral oil distribution transformer located indoors within the dockyard. It had become extremely wet, with core insulation readings by Megger test of <20MΩ. Oil testing showed that the transformer had very wet insulation; the mineral … Continued

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  • Retrofilling for environmental protection, Berlin

    Customer: Vattenfall Location: Berlin, Germany Application: Distribution Transformers Highest Voltage: 6/10kV Rating: Typically 400-600kVA Date: 1992 to present   Vattenfall is a large utility company operating across northern Europe, including Germany and the Netherlands. Part of its operation is providing the electrical distribution network for Berlin, where MIDEL 7131 has been used extensively. Berlin presents very specific challenges … Continued

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  • Retrofilling

    Retrofilling is the process of replacing mineral oil insulating fluid in an existing transformer with MIDEL fluid. Doing so effectively upgrades the transformer while delivering other demonstrable benefits. Reasons for retrofilling with MIDEL: Makes financial sense – get all the benefits of MIDEL without investing in a new transformer Remove fire risk – the high fire point of … Continued

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